Metric gears use metric design units such as millimeters (mm). Their pitch, the metric distance between teeth, is designated as a module.

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Spiral bevel and miter gears have a right or left hand specification, which describes the direction of tooth curve. If they have spiral teeth, bevel and miter gear sets must have opposite hand specifications to mesh, i.e., a left-hand pinion will drive a right-hand gear and vice versa. Matching items for sets are listed according to the hand specification of the pinion.

The screw advances when turned counterclockwise. This is an unusual or specialty configuration.

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Pressure angle is the angle between the line of force or action and the tangent to the pitch circle at the point of mesh. The most common pressure angles for gears are 14.5° and 20°, while some worms and worm gears utilize a 25° pressure angle. Gears must have the same pressure angle to mesh.

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Rack teeth are machined or ground directly onto the moving element to increase power transmission efficiency.

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Aluminum is a bluish, silver-white, malleable, ductile, light, trivalent, metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation. It is lighter than steel, but not as strong.

Cast iron is a very durable iron alloy with high amounts of carbon. Types include ductile iron, gray iron and white cast iron grades. Differences in grades are due to variations in composition and processing.

Steel is a commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. Many grades of carbon and alloy steel are available. They may require coating to protect against corrosion, however.

Steel may be hardened in a number of ways. These include a variety of quenching techniques in oil and water, passing the steel through induction chambers, etc. Quickly cooling steel during processing freezes, traps and packs the carbon atoms inside the shrunken iron crystals, thereby producing a very hard and brittle metal. Although very hard, it cannot absorb much shock or impact without breaking.

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A hub is a cylindrical projection from one or both sides of the gear, typically for the provision of a shaft attachment mechanism such as a set screw. Hubless gears are typically attached via a press-fit, adhesive, or an internal keyway.

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